title: Comprehensive pathway-based association study of DNA repair gene variants and the risk of nasopharyngeal carcinoma.
abstract: DNA repair plays a central role in protecting against environmental carcinogenesis, and genetic variants of DNA repair genes have been reported to be associated with several human malignancies. To assess whether DNA gene variants were associated with nasopharyngeal carcinoma (NPC) risk, a candidate gene association study was conducted among the Cantonese population within the Guangdong Province, China, the ethnic group with the highest risk for NPC. A 2-stage study design was utilized. In the discovery stage, 676 tagging SNPs covering 88 DNA repair genes were genotyped in a matched case-control study (cases/controls = 755/755). Eleven SNPs with P(trend) < 0.01 were identified. Seven of these SNPs were located within 3 genes, RAD51L1, BRCA2, and TP53BP1. In the validation stage, these 11 SNPs were genotyped in a separate Cantonese population (cases/controls = 1,568/1,297). Two of the SNPs (rs927220 and rs11158728), both in RAD51L1, remained strongly associated with NPC. The SNP rs927220 had a significant P(combined) of 5.55 × 10(-5), with OR = 1.20 (95% CI = 1.10-1.30), Bonferroni corrected P = 0.0381. The other SNP (rs11158728), which is in strong linkage disequilibrium with rs927220 (r(2) = 0.7), had a significant P(combined) of 2.0 × 10(-4), Bonferroni corrected P = 0.1372. Gene-environment interaction analysis suggested that the exposures of salted fish consumption and cigarette smoking had potential interactions with DNA repair gene variations, but need to be further investigated. Our findings support the notion that DNA repair genes, in particular RAD51L1, play a role in NPC etiology and development.
authors.affiliation: State Key Laboratory of Oncology in South China, Department of Experimental Research, Sun Yat-Sen University Cancer Center, Guangzhou, China.
authors.forename: Hai-De
authors.initials: HD
authors.lastname: Qin
authors.forename: Yin Yao
authors.initials: YY
authors.lastname: Shugart
authors.forename: Jin-Xin
authors.initials: JX
authors.lastname: Bei
authors.forename: Qing-Hua
authors.initials: QH
authors.lastname: Pan
authors.forename: Lina
authors.initials: L
authors.lastname: Chen
authors.forename: Qi-Sheng
authors.initials: QS
authors.lastname: Feng
authors.forename: Li-Zhen
authors.initials: LZ
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.forename: Jian Jun
authors.initials: JJ
authors.lastname: Liu
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Jorgensen
authors.forename: Yi-Xin
authors.initials: YX
authors.lastname: Zeng
authors.forename: Wei-Hua
authors.initials: WH
authors.lastname: Jia
mesh_terms: D016022:Case-Control Studies; D004260:DNA Repair / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics; D005260:Female; D024522:Genes, BRCA2; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide
chemical_list: D004268:DNA-Binding Proteins; C413002:RAD51B protein, human